Sash-pulley.



, No; 852,551. v PATBNTBD .MAY 7, 1907..

'0. H.l FOSTER.

. SASH PULLEY.

APPLIOA'TIQN .FILED 1113.26, 190s.

AYTORNEK l CHARLES H. FOSTER, OF ST. LOUIS, MISSOURI.

SASH-PULLEY.

Specification of Letters Patent.

Patented May 7, 1907.

Application filed February Z6, 1906. Serial No. 303,059.

T0 a/ZZ whom, t may concern.'

. Re it known that I, CHARLES II. FosTER, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Sash-Pulleys, of which the following is a full,y

clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in sash-pulleys and it consists in the novel construction and arrangement of parts more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a vertical section of the sash-weight box of a window frame taken on the line 1-1 of Fig. 2; Fig. 2 is a face elevation of the stile of the window frame and of the casing supporting the pulley, showing in dotted outline the distended position of the side wall of the casing during the driving of one of the pulleysections into position; Fig. 3 is a transverse section on line 3-3 of Fig. 1 g and Fig. 4 is an enlarged section on the same line as Fig. 3, showing the mannerof assembling the parts, one ot the pulley sections being in place and the other partially driven through the casing.

The object of my invention is to construct a sash-pulley which shall be comparatively light, noiseless, and cheap; one reducing to a minimum the number of steps involved in the process of its manufacture, one capable of restoring the cord passing over the pulley in the event of displacement of such cord by a sudden jerk or opening of the window sash; one which does not cut the sash cord and one possessing further and other advantages better apparent from a detailed description of the invention which is as follows:

Referring to the drawings, B, represents the box of the window frame within which the pulley is mounted and within which the weighted cord a, coupled to the window sash S operates all as fully understood in the art.

In my present invention the pulley is made in two sections 1, 1, which when assembled form a complete peripherally grooved pulley split in the plane of its rotation. The outer face of each section l has a depression leaving a marginal rim 2, the depth of the depression being substantially that of the annular shoulder 3 which defines the thickness of the rim 2. The sections 1, are each provided with outer bosses or trunnions 4 which are received by the inclined bearings or recesses 5 in the side walls of the casing 6 in which the pulley is mounted. Formed at the front longitudinal edges ot' the inner side Walls of the casing 6 are projections or teats 7 which enter the depressions of the sections 1 behind the shoulders 3 thereby permanently retaining the pulley in the casing. In assembling the parts, one section 1 is first inserted into the casing 6, (Fig. 4), the trunnion 4 thereofl being inserted into its respective recess 5, the teat 7 entering behind the annular shoulder 3; then the other section 1 is inserted and driven into position, the side walls of the casing yielding suficiently to allow the outer face of the rim 2 to pass the adjacent teat 7. /Vhen the teat has passed oif the rim opposite the depression of the pulley section, the side walls of the casing 6 will spring toward each other causing the teat 7 to snap behind the shoulder 3, and retain the pulley permanently in place.` The casing 6 though of cast metal has sufiicient spring to it to allow the section 1 to be driven past the teat 7.

The purpose of making the pulley in two sections is to dispense with the necessity of resorting to a three-part i'lask in the casting of a grooved pulley made of one piece another reason is that the two sections rubbing together destroy that metallic ring so characteristic of metal castings making a sectional pulley comparatively noiseless, the two juxtaposed sections interfering with the free vibrations which impart the noise to a pulley made of one piece of metal. The purpose of inclining the recesses or bearings 5 toward the face of the casing 6 or toward the window sash is to prevent the pulley from any tendency to roll away from the sash, a tendency which would exert a diagonal draft on the (ord immediately in connection with the sash and cause said cord to rub unduly against the face of the casing and even tually be destroyed. The inclined recesses retain the pulley Well toward the sides or stile of the window frame and thus prevent the results referred to. The walls of the groove of the pulley merge with the edges of its faces along graceful curves so that cutting and deterioration of the cord is reduced to a minimum.

It will be seen that the inner half of the pulley proj eots beyond the rear edge of the casing 6 which houses it, the object of exposing so much of the pulley being to restore the cord back to the groove should said cord slip IOO IIO

,to revolve inwardly, the edgey thereo out on account of some sudden upward jerk of the window sash. For example, as shown in the dotted position in Fig. 1, the

cord a which has been accidentally displaced and now hangs over the face of the pulley will be restored back to the groove by rotation of the pulley in roper direction which may be accomplished by raising the sash. The raising of the sash will cause the ulley gflP ping the cord and gradually restoring theflatter back on the groove in which it is designed to travel. Vhere the side walls of the casing fully envelop the pulley this restorationof the cord back-to its groove is impossible.

Havingy described my invention, what I claim is:

1. In-combination with a pulley composed of two independently rotatable sections separated or split in the general plane of rotation of the pulley, the contacting faces of the sec tions being mechanically disconnected, a casing having springing walls for permitting the independent insertion thereinto of each section of the pulley, and means on the casing Vfor rotatably and independently supporting the respective sections in juxtaposed relation, substantially as set forth.

2. In a sash pulley, a pulley formed of two sections split or separated in the plane of rotation of the pulley, a casing for the pulley, the 'latter having depressions on its outer faces, and marginal rims raised above the bases ofvsaid depressions, and teats or projections disposed on the walls of the casing and adapted to enter the depressions aforesaid behind the marginal rims thereof, substantially as set forth.

3. In a sash pulley provided with marginal recesses or depressions on its outer faces, a casing for receiving the pulley, the latter being split in the plane of rotation thereof, a boss or trunnion for each section of the pulley, inclined recesses formed in the casing for the support of the trunnions, and formations on the casing engaging the recesses on the pulley for retaining the latter in position,

substantially as set forth.

4. In combination with a pulley having depressions formed on its outer faces, marginal rims projecting beyond the depressions, a casing encompassing the pulley and having yielding walls, and teats or projections on the casing walls adapted to wedge past the rims and enter the depressions behind the rims, and means for rotatably mounting the pulley in the casing, substantially as set forth.

In testimony whereof I afliX my signature, in presence of two witnesses.

CHARLES H. FOSTER.

Witnesses:

EMIL v STAREK, A MARY D. WHrrcoMB. 

